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Wide mains, 19V/8A power supply including power factor correction

Posted: 28 Aug 2008     Print Version  Bookmark and Share

Keywords:power factor correction  power supply  power factor controller  PFC stage 

When associated to forward or half-bridge converters taking advantage of a narrow input voltage range, the power factor correction (PFC) should be designed to start first and to remain active as long as the power supply is plugged in. More specifically, the downstream converter turns on and operated while the output of the PFC stage is nominal. In other words, the PFC should the master.

The NCP1605 is a power factor controller especially designed to meet these requirements. This driver features a "pfcOK" pin to enable the downstream converter when the PFC stage is ready for operation. Practically, it is in high state when the output voltage of the PFC stage is within regulation and low otherwise (fault or start-up condition). In addition, the PFC stage having tor remain active in light load conditions, the NCP1605 integrates the skip cycle capability to lower the standby losses to a minimum.

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